In her book Heirloom Machine Quilting, Harriet Hargrave explains how to layer your quilts on a smaller table. Basically you clamp down the back, start pinning from the middle and when the part on the tabletop is all done you shift do another section, reclamp the bottom layer and continue. I pin every two inches and use those plastic pin covers (Quilters Delight) and one of those wooden pin grabber thingies (Kwik Klip) and it works like a dream on my kitchen table. Also, the clamps I use are these blue and yellow plastic clamps I got from Home Depot - very easy to move.